Will Neil deGrasse Tyson’s mix of science and pop culture be enough to fill the Jon Stewart void?

“We have to take a selfie! We have to take a selfie!” says Neil deGrasse Tyson, astrophysicist, cosmologist and perhaps the only living scientist with cult-like celebrity status. On a Tuesday evening in January he is standing under the giant sphere of the Hayden Planetarium, where he serves as director, urging some friends to join him.…